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  <section id="macho-compatibility-version">
<span id="prop_tgt:MACHO_COMPATIBILITY_VERSION"></span><h1>MACHO_COMPATIBILITY_VERSION<a class="headerlink" href="#macho-compatibility-version" title="Permalink to this heading">¶</a></h1>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.17.</span></p>
</div>
<p>What compatibility version number is this target for Mach-O binaries.</p>
<p>For shared libraries on Mach-O systems (e.g. macOS, iOS)
the <code class="docutils literal notranslate"><span class="pre">MACHO_COMPATIBILITY_VERSION</span></code> property corresponds to the
<em>compatibility version</em> and <span class="target" id="index-0-prop_tgt:MACHO_CURRENT_VERSION"></span><a class="reference internal" href="MACHO_CURRENT_VERSION.html#prop_tgt:MACHO_CURRENT_VERSION" title="MACHO_CURRENT_VERSION"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">MACHO_CURRENT_VERSION</span></code></a> corresponds to
the <em>current version</em>.  These are both embedded in the shared library binary
and can be checked with the <code class="docutils literal notranslate"><span class="pre">otool</span> <span class="pre">-L</span> <span class="pre">&lt;binary&gt;</span></code> command.</p>
<p>It should be noted that the <span class="target" id="index-1-prop_tgt:MACHO_CURRENT_VERSION"></span><a class="reference internal" href="MACHO_CURRENT_VERSION.html#prop_tgt:MACHO_CURRENT_VERSION" title="MACHO_CURRENT_VERSION"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">MACHO_CURRENT_VERSION</span></code></a> and
<code class="docutils literal notranslate"><span class="pre">MACHO_COMPATIBILITY_VERSION</span></code> properties do not affect the file
names or version-related symlinks that CMake generates for the library.
The <span class="target" id="index-0-prop_tgt:VERSION"></span><a class="reference internal" href="VERSION.html#prop_tgt:VERSION" title="VERSION"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">VERSION</span></code></a> and <span class="target" id="index-0-prop_tgt:SOVERSION"></span><a class="reference internal" href="SOVERSION.html#prop_tgt:SOVERSION" title="SOVERSION"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">SOVERSION</span></code></a> target properties still
control the file and symlink names.  The <code class="docutils literal notranslate"><span class="pre">install_name</span></code> is also still
controlled by <span class="target" id="index-1-prop_tgt:SOVERSION"></span><a class="reference internal" href="SOVERSION.html#prop_tgt:SOVERSION" title="SOVERSION"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">SOVERSION</span></code></a>.</p>
<p>When <span class="target" id="index-2-prop_tgt:MACHO_CURRENT_VERSION"></span><a class="reference internal" href="MACHO_CURRENT_VERSION.html#prop_tgt:MACHO_CURRENT_VERSION" title="MACHO_CURRENT_VERSION"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">MACHO_CURRENT_VERSION</span></code></a> and <code class="docutils literal notranslate"><span class="pre">MACHO_COMPATIBILITY_VERSION</span></code>
are not given, <span class="target" id="index-1-prop_tgt:VERSION"></span><a class="reference internal" href="VERSION.html#prop_tgt:VERSION" title="VERSION"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">VERSION</span></code></a> and <span class="target" id="index-2-prop_tgt:SOVERSION"></span><a class="reference internal" href="SOVERSION.html#prop_tgt:SOVERSION" title="SOVERSION"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">SOVERSION</span></code></a> are used for
the version details to be embedded in the binaries respectively.
The <span class="target" id="index-3-prop_tgt:MACHO_CURRENT_VERSION"></span><a class="reference internal" href="MACHO_CURRENT_VERSION.html#prop_tgt:MACHO_CURRENT_VERSION" title="MACHO_CURRENT_VERSION"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">MACHO_CURRENT_VERSION</span></code></a> and <code class="docutils literal notranslate"><span class="pre">MACHO_COMPATIBILITY_VERSION</span></code>
properties only need to be given if the project needs to decouple the file
and symlink naming from the version details embedded in the binaries
(e.g. to match libtool conventions).</p>
</section>


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